I know I have. Having tried the demo, I was blown away. Not just by the attention to detail, but the balancing for a change. I cannot stress that enough. It's like how every species has their own ups and downs, yet that's faithful to the films and intertwines fairly with other species; no more being a powerhouse, you've got to understand your weaknesses in order to take absolute advantage of your strengths. That's what I call gameplay.
By the looks of it all, every species weapon is available, including the Sniper Rifle which is now a pretty damn legitimate weapon to use (needs to be scoped for accuracy; body shots doing decently; head shots possibly downing someone in an instant, like it should be).
I'm really anxious for the full game, 100%. February 16th is so far away, damn it. Ah well, all the species is more and less the same as before, but much more refined and fair. I just want to experience the full material now. Graaaah. x_x
PS; if you're a Marine, keep a close eye on your motion tracker... it'll blink a lot. And never, ever forget to check your flank at all times... people sure love the Trophy Kills. Can't argue why. xD